161784086 has 4 divisors (see below), whose sum is σ = 242676132. Its totient is φ = 80892042.

The previous prime is 161784061. The next prime is 161784101. The reversal of 161784086 is 680487161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 680487161 = 6709 ⋅101429.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40446020 + ... + 40446023.

It is an arithmetic number, because the mean of its divisors is an integer number (60669033).

Almost surely, 2^161784086 is an apocalyptic number.

161784086 is a deficient number, since it is larger than the sum of its proper divisors (80892046).

161784086 is an equidigital number, since it uses as much as digits as its factorization.

161784086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80892045.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 161784086 is about 12719.4373303224. The cubic root of 161784086 is about 544.8938838931.

The spelling of 161784086 in words is "one hundred sixty-one million, seven hundred eighty-four thousand, eighty-six".